Active trails - http://tracksandtrails.org.au/doc/Active_Trails.pdf (2.4Mb PDF). A document from the Queensland Government, Office of Urban Management concerning the development of state funded mountain bike trails, urban cycleways, multi-use tracks, rail trails and canoe trails for South East Queensland.
Gap Creek Trails Alliance - http://www.gcta.asn.au/ Responsible Mountain biking on sustainable trails.